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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9111f31c43bbe7fbb83b581d79a6b76053e03004f7564ead6c83bbfd62bfbbfe' 
  AND token = 'yxl1+pn4sIKyPxFP1OxTkAU/De2qJ7I3e0fN46Vhz/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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