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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '155a73207fb8dec61fbdbd7ebf0ea0641065c899a46e48eac001f92a296dd4f9' 
  AND token = 'Md/gtfr3c89G7IM7jB0WAS63rHnWTDKF6z+fIfrPN6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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