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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9bfa9ad69dc97abdb179390322c34209487802cb84734f217377cd366e4ec7ac' 
  AND token = 'eAbBLIAiV5zLeRcXqJNpJEnp+2tKM8Iv0GoUOm/Tlb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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