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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e114e2768b276ba3c4d3ac6e744ec90ffa32d6d67961e696cc859586c09c728' 
  AND token = '6iEJiAaqIojEkc8Q9+jJMHEtpPcJnqU1L7VtgZCZgtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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