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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b4baf619575382f900b97787d677396892e1c2351bb86b0969c981db43b15d4d' 
  AND token = 'MKt+sDd15DAJSTSPyaCUBx9NFqsLBK3p2GblVfKDAL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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