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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a1e2c584f77af1442535b2c8b3b444ceeeae9b4c6f4c2ce253a75d3ab53754f3' 
  AND token = 'UKo4RyTT2L+4q1YpBWUTjZbhsMu9txo5572YQ+gO8Do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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