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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '95735eaf68cd14e1f0b652d3419a8607f3e5aeaff7c22e0245c648ef6b742d6d' 
  AND token = 'pQzxIdgQib2bMFWogQDMhm5eKf13/uTFJyasY6/9ZSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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