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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c450c4f18891632328df230a1fee5a8466cc33703c3d6943905979f833410474' 
  AND token = '3bxvzBM/n/8SOFC8FOTePlLxqORQgD7BRD9Qx+NQzb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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