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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b556f641e3376d8122f0c4bf3867a01591787dce0aaec1bea6370339c779717c' 
  AND token = '6YaXzQzrd6lpINKOdUVwoWESQvagyqbJA2SxGpG0aIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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