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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a301ff8675b9e83b141e688fa904e935bef7bb9883ba1a7a657d153b34652b0d' 
  AND token = 'OB6H6gg/K6yGafzTIbonjoniFSvI8nu9Q3Le656y8Lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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