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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f6abf52bb2fad1009974e0f86541ca0557a5d8f5a49d826a17a0fce32160951' 
  AND token = 'ik6AulpiI9+lBXIlsJMyIJK6ub8gfTw4u0+r6sOmxWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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