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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca21056d3bf09babb131f61d0f4f6be3e11aa79f58b4cbff000e783a2bcd183d' 
  AND token = 'r3fuuXp0iuKJjezab3dluRrCaOSIl2XzCWw0cHV24ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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