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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '095bd7f5c08160e8099cd06afe7c9f946dd07ef9f44cbee0e5dc0e00c8b8179c' 
  AND token = 'N042IbBLPUuza4iSjoNVoYzU3Sux8eT1oVoF8WyNqlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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