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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a9333c3a350becdad87fc4f8f4f9b2519cee1b157b7d2d7f9a0f6bde1444ced4' 
  AND token = 'k87dByT16/H5qFEAcKjKZh7WqNLsafKVeNV04S+YQKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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