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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d6f23a65951dd5136ea43260ce58fe6e410fa655edbc7f40bf7a2d03553b45c' 
  AND token = 'Lq84S5af1M3YEViP/zlzeCH0zDLCcM+fmNKRHYjHuAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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