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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bcb12335fabf0988056b9b4f06cf52607eb70ac3e117408db64d5e58bbfe58d6' 
  AND token = 'fCTe/0TwoQIDeqlt5NVVsshxlDrVwUW91OX6s9Q2B4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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