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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef217b627758fe394298e4c1edd90beadc4f8a0f778485f3e4073db15c874dbe' 
  AND token = 'iBjWNAM4cWdnNpfj9ZpM+MoKpfuj4XaoL8JB1Keeq3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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