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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd30a67ab25a9ea80ab89ed950870a493f6e1d3500c3d6593a7e7b0b3f5852b44' 
  AND token = 'ip6B5E2rXfj0k73svyjLbdU6JmEx7QD04lbnpJe1znM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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