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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a368f88a51b922d25e6c031c365d4d49b62d3f848750d26d8c869db603ea0aae' 
  AND token = 'NLteVzqUscJwV81/R2K3yT9pFxy+1dNd3I/7vi84gOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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