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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab46753a06d1de474b4334c82c69e2dd364f73d0b3f531ef3421df9163874b5b' 
  AND token = '6+7OiaydU3Oi0FNZ5LpvEzNyPsrhItwvFAQaisQNGew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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