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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f4856b6985c641dd16919b8327076b6d772aeb6c2ae3af6497b688de5b8a54ca' 
  AND token = 'C1dLYWXFPeIAaFu0FcMRehbUTaDOVO/1ZtPAC4h7YdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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