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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a9af53b7035e8a79ed0bf47f11d34b68ed5418e36304f0a1ee61258a16aa966a' 
  AND token = 'rSACQTmn48hL+VNS7IGlZ8JmbSW78DFpoOoucxs2Wjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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