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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d4cbfc7622d5c02ba76ffa483dc87412734257ce7a15eb72c0a36734d599a8d' 
  AND token = 'hS9rpjsTAqbngP2OIc5ga4kK1rFakD3xYRu0MR/pmEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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