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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2960165580560fed805b94c714860ff1987c001cb4d7ce49829e7f7cfca9c4a6' 
  AND token = 'IiJ3LJITpBuAcP1P6hfe2jamaxurqgabFsu1BKADFGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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