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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4bfcd1011b4801c73348df453c51984d3a38144c7ccb919fac94c97a55e545ea' 
  AND token = 'W3uuKF+TvUhzJkAsmPUWu9lBKnqkgMT1Bzz+0d9NR6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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