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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '58677488adca0b0d1f2d282be0cd2ba3ddcc525fb764593eaf3dd73df4c78c71' 
  AND token = 'zfTuDyiJxE+ksb5EYOLlLTDi5ls+Ap/OZ9BCC45Ia4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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