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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '74b4f83a6f0d740ee3307b33c957174b469a27f7ad1eaf2bca7cd3c48c72f27d' 
  AND token = 'DKNOOt3SNaaLgS3yrg0Baal4DKZtPielvBSrXmmj0/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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