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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c1176f40affb156d1d25f6b499a075a462fdbaacabbe92c5e2b172cf380c786b' 
  AND token = '30ycc96c/Fm8WLJBiuSKDbMy+8JVNwd3EJtEUZeWLUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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