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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '716929b6e521a7707337da5a27eb071977e35256074413d96e99d1409a2bdfab' 
  AND token = '3TvxsJuvk9YPNcXX2+OaJZlatRaA1AKyQQZY+rvg9Dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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