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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c85471c2404ed6e738f6024d5eb169f3e2e6ff74cf2fdeeafb35b167acb8cab9' 
  AND token = 'YsEix1kB1gvHUGH8uTRDKUvtlTknukrC+FvbSlED4aE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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