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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a32c2255c269780ff47d371c34737fa713796df2b85998c1bebe99187fe95c17' 
  AND token = '+vxfz7MlMKuEryzjAU8Jo7Krkja09CZPDC0h17cNONo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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