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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5a02b11e0091324ed2b1655dcac8310046c37bba59b5230af06d23bf363af71e' 
  AND token = 'u1HbBtG6RItny/hGeA9RArrOfvjl6djxN8PCF94K3JY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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