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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5a98fc788a8a0ab612bbfd19ff7fef8b3b1df3afeae5ea4a4c03485b03242d2b' 
  AND token = '+hM/dFTFrWXl1ggtCtqLwDhDnU8De181enbV+AS7eCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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