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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5cddc5d688e2c86eeb4241362e3f36cb2bd424d50b6eaf064d8298dcc95e06e' 
  AND token = 'IEMsgYicgeX3nazIPSYXTVe+0sQAxAzwOe+T1BxHpoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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