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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '54cc47dd1df73a06bda02288580fdcfea114b35d5df8ee5a1d3c8532c9898626' 
  AND token = '/dLuAdzN3VpHYXYeGhu9k/TymuxCyoaqo46Tk35HzSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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