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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '61e25e8cda54fefd6fb20d2770def5f4b27bf3b4b82f1cca08d79ef739354a1c' 
  AND token = 'zk/OXA/rcJoOJ9ZVIJgUx0a30ecH2RGSft0bc5d+/Uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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