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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b27177bb7d8ae61203298cffb9088ea0c74e6ce213e5bdd036c668117218bb6d' 
  AND token = 'qdyug3175GHqnYPfVkHDVP0jG136NkaIfWgLbm+oAH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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