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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd8051dada17064f2c5630e2dc5753f7323858c97445843a5aadbe827a1287c1b' 
  AND token = 'R5D8kWnZH8xuCDicRyMG69ZcPkTu61MoQpxCSHJj8wE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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