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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4451fc17201e438ff0879c46a190097742bcb59e3118f3c25b7a5eb4f3c11cfc' 
  AND token = 'HqMN/iRK4vff9+NO/fn7Z3/xucr+5toWZSYS2njjats=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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