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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '855d1ce5645cf852268da6adba0999de0cc99d7bba722dcd55e0c342b4ed326d' 
  AND token = 'd21Z0YZw1YrXpr2/1XIjuNYWfMpydEVCFQ7tdrztpyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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