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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '58d0917b7a79c9c3edb206b3ecee16f748f3a33a1a48464aa4ff428f8d590e46' 
  AND token = 'OK/S02zCrlPru8LYo4sckLjli5TItp88GSttNpVKcNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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