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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '483fb430058f268dbb5c7c0bf91277f4c1d3208544a92091f4e075bd4011d410' 
  AND token = 'VBJ8gMmxm1sETLyMJEX41lJEhkZlf646VZX3yK9KBjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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