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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a6fda430208a99687db00cd1993c3f15c131e5a346960e7e402d0e5addb111dc' 
  AND token = '1+avZfwrIRUYvTp6qdlrGb/83JerTTKNB0XvR1XROoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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