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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b2c8b41a5a6eb0116a3c1ac698458b055791551c4e2f770b860745029a8270b2' 
  AND token = '2c2JSL55RlulFZxX3oBq3xgjng2DBesc9Bi/6SKQ8G0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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