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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e84e4038fe639161d7fd6a27259b94aba4a23ef681a067ad65e650d4e9432fa7' 
  AND token = 'ruywMpKIN0HsdR76/cuXeyeJz7q42SqTPzXxenfwHi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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