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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f163b3da525a8bf9a12791fe49b3e6329e13f53b1c4815e803e5e9663921d105' 
  AND token = 'mqnRlKU2r4UE0T/Uv+JXLHPuvOd82zki6J51c1no++g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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