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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '619e0cfd81adaa04889d50d5ad446d5a57be2bcef53359febfced03eaad975df' 
  AND token = '6qrsmaPCF0rEwES5rKMWAw+/oz8sFo+kooaP+umb/Es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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