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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c7b7239134da787f6f0b69280cae81ab80b91ad1689f178f8877e9f5c5413c3a' 
  AND token = 'vmN7sRz+JwSNkMtHlmu9E8aph12xo5AKvs7fIH3G6OM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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