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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '003902bef7d3b6f35a15d8e63ccb9727c53da92bf597221e2861e173ba41b941' 
  AND token = 'J2bGLxBA0z69/cMMTbFwix0ibXV7pkINQjXrH/pDfBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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