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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2865bbe35eca4e768bfc34490960a4a22ea7d6c59bf116fbac1cb54c5882eb6b' 
  AND token = 'R1cpHjRkQMkNIspeOorcw3n6Z85jadzZOiMhpeR8Sf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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