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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b1c7a3b2aef69da5e0909d7572a0144da9f35f8ce6b234177f8ae9ef037b5cf' 
  AND token = '3MMSBMo93bQ8zelF6aHB8eCNteDHY8yFpJdv4/gQZUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}