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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5cecbde007e2bb23f965aa164362d17f20bbc269c4f38e14c5da59505dae0efe' 
  AND token = 'h47rAoZBfKPpAMQ/04bDgErbQaVtzXK9HiqUtoC8XQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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