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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96494f3cd8330adc297ff59916decef2c490c211724f4bbfaa242eb74b6defee' 
  AND token = '+OAi4woeD6AyXAW4u/cjJu9BSNPdzx/0GcUaRtbdJbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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