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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3a22627c76d0e04ae865505c5d62e588d3e5066a323182e63588ebad4d2475cb' 
  AND token = 'aLmOEWsI9YYhzqLdV6ofRWq/RbRCa8MVnmbdCp5L7vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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