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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'abc6fae318eae8c4c81d3faaee4fb5f92f8ab93ad1876a3ba6f48b01ba9269a6' 
  AND token = 'PL+bvGmnHoaAn5UsOJhek1N3goy89fEoNGhy2dtXJfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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