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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'df32d75766aae84f9206cf405dbaadb392fc7a94d98a043bd47b904a63f77bf6' 
  AND token = '5aEQaPG9V94M3Ud5B+WQNO1VR2dnespG+cAS4RNG2VA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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