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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e10bba0dfa9caee518fc8a166c49b91ebc82f6cb7d9ea87ecabeabb0d86cf1c' 
  AND token = 'H7XjS5xetxgZX1X/4sSk1ydCqeF+Kht9ngRDdu/Iimc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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