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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '781df9e7baa9bc2ebc96688b3a9a59cf965f34cc246b8249fb9bda6626c9c87d' 
  AND token = '8zsttfXh62NSv5ajCxTM2W6dMREAsU6846OVEJM4aUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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